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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.shared.inputs;


import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import org.graylog2.plugin.IOState;
import org.graylog2.plugin.inputs.MessageInput;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import jakarta.inject.Singleton;

import java.util.Set;
import java.util.stream.Stream;

@Singleton
public class InputRegistry {
    private static final Logger LOG = LoggerFactory.getLogger(InputRegistry.class);

    private final Set> inputStates = Sets.newConcurrentHashSet();

    public Set> getInputStates() {
        return ImmutableSet.copyOf(inputStates);
    }

    public IOState getInputState(String inputId) {
        for (IOState inputState : inputStates) {
            if (inputState.getStoppable().getPersistId().equals(inputId)) {
                return inputState;
            }
        }

        return null;
    }

    public Set> getRunningInputs() {
        ImmutableSet.Builder> runningInputs = ImmutableSet.builder();
        for (IOState inputState : inputStates) {
            if (inputState.getState() == IOState.Type.RUNNING) {
                runningInputs.add(inputState);
            }
        }
        return runningInputs.build();
    }

    public boolean hasTypeRunning(Class klazz) {
        for (IOState inputState : inputStates) {
            if (inputState.getStoppable().getClass().equals(klazz)) {
                return true;
            }
        }

        return false;
    }

    public int runningCount() {
        return getRunningInputs().size();
    }

    public MessageInput getRunningInput(String inputId) {
        for (IOState inputState : inputStates) {
            if (inputState.getStoppable().getId().equals(inputId)) {
                return inputState.getStoppable();
            }
        }

        return null;
    }

    public IOState getRunningInputState(String inputStateId) {
        for (IOState inputState : inputStates) {
            if (inputState.getStoppable().getId().equals(inputStateId)) {
                return inputState;
            }
        }

        return null;
    }

    public boolean remove(MessageInput input) {
        final IOState inputState = this.stop(input);
        input.terminate();
        if (inputState != null) {
            inputState.setState(IOState.Type.TERMINATED);
        }

        return inputStates.remove(inputState);
    }

    public boolean remove(IOState inputState) {
        final MessageInput messageInput = inputState.getStoppable();
        return remove(messageInput);
    }

    public IOState stop(MessageInput input) {
        IOState inputState = getRunningInputState(input.getId());

        if (inputState != null) {
            inputState.setState(IOState.Type.STOPPING);
            try {
                input.stop();
            } catch (Exception e) {
                LOG.warn("Stopping input {} failed, removing anyway: {}", input.toIdentifier(), e);
            }
            inputState.setState(IOState.Type.STOPPED);
        }

        return inputState;
    }

    public boolean add(IOState messageInputIOState) {
        return inputStates.add(messageInputIOState);
    }

    public Stream> stream() {
        return inputStates.stream();
    }
}